Pre Mix

[pistons]

Hi guys I just wanted to double check my ratios. With running premix I always used the ratio of 40-1 which worked out to 125mls to every 5ltrs of fuel I think thats right?
Is this still a ok mixture to run on my KDX?
Also someone else mentioned that because it has had a very recent topend rebuild to run it at 32-1 so a little bit richer.

 

[dirt bike dave]

In a trail ridden KDX, You will be fine at 40:1 with any decent oil. Yes, 125 ml per 5 liter is 40:1.

32:1 does provide a little more lubrication. For us in the USA, that's 4 ounces per gallon (128 ounces).

No downside to running more oil, except for the cost of the oil.

I'm sure someone will point out that 40:1 is actually richer than 32:1 (more fuel will go in at 40:1 than 32:1), but in reality it will not make any noticeable difference in your jetting.

 

[EYY]

Yeah it should be fine with either, as long as it is jetted to suit. I've always used yamalube at 32:1 and haven't had any problems.

 

[geoffro]

If you not racing you can run 50:1 safely. Dont waste oil. Yes hundreds will say oil cheaper than doing a motor... Thats why trials bikes run 100:1 and many NEW KTM's manuals suggest 50:1... As for doing a motor, many here will vouch for their KDX's having stock motor/piston after 5,10 years plus.... Im no scientist but a mechanic and on my 34th bike....